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https://issues.apache.org/jira/browse/KAFKA-7509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17516226#comment-17516226
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Chris Egerton commented on KAFKA-7509:
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Alright, I dug a little deeper and it looks like this has been discussed in
even greater detail in KAFKA-6793 and
[KIP-552|https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=142641934].
The progress there stalled after the concept of the {{RecordingMap}} mechanism
was brought up.
I think that that approach has some merit and have put together a proof of
concept here: [https://github.com/apache/kafka/pull/11986]
This may still require a KIP (possibly just alterations to the existing
KIP-552), but it's borderline.
[~mjsax] does it look like this same approach might work with Streams too?
> Kafka Connect logs unnecessary warnings about unused configurations
> -------------------------------------------------------------------
>
> Key: KAFKA-7509
> URL: https://issues.apache.org/jira/browse/KAFKA-7509
> Project: Kafka
> Issue Type: Improvement
> Components: clients, KafkaConnect
> Affects Versions: 0.10.2.0
> Reporter: Randall Hauch
> Assignee: Chris Egerton
> Priority: Major
>
> When running Connect, the logs contain quite a few warnings about "The
> configuration '{}' was supplied but isn't a known config." This occurs when
> Connect creates producers, consumers, and admin clients, because the
> AbstractConfig is logging unused configuration properties upon construction.
> It's complicated by the fact that the Producer, Consumer, and AdminClient all
> create their own AbstractConfig instances within the constructor, so we can't
> even call its {{ignore(String key)}} method.
> See also KAFKA-6793 for a similar issue with Streams.
> There are no arguments in the Producer, Consumer, or AdminClient constructors
> to control whether the configs log these warnings, so a simpler workaround
> is to only pass those configuration properties to the Producer, Consumer, and
> AdminClient that the ProducerConfig, ConsumerConfig, and AdminClientConfig
> configdefs know about.
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